66855307 has 2 divisors, whose sum is σ = 66855308. Its totient is φ = 66855306.

The previous prime is 66855293. The next prime is 66855311. The reversal of 66855307 is 70355866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66855307 - 2¹⁹ = 66331019 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66855307.

It is not a weakly prime, because it can be changed into another prime (66855317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33427653 + 33427654.

It is an arithmetic number, because the mean of its divisors is an integer number (33427654).

Almost surely, 2^66855307 is an apocalyptic number.

66855307 is a deficient number, since it is larger than the sum of its proper divisors (1).

66855307 is an equidigital number, since it uses as much as digits as its factorization.

66855307 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 151200, while the sum is 40.

The square root of 66855307 is about 8176.5094630900. The cubic root of 66855307 is about 405.8622224145.

The spelling of 66855307 in words is "sixty-six million, eight hundred fifty-five thousand, three hundred seven".